See timeline.
This makes the migration hanging a left at the Russian steps to the new world more interesting, although this may be considered part of Asia, but attempts to explain 'modern' humans polar trek instead of shorter across the pond as the weather, being warmer at the pole?, and 'nonhuman' occupation of Europe stifling the modern migration. What if the two got together and jumped the pond? Anyway, old arguments. Farther and farther back.
The article mentions mutation rate. See timeline. Indigenous North Americans, first people, have a faster genetic change than most. This needs to be factored in if that's mutation rate.
Still no answer how Indigenous north american first people, haplogroup x (1985/6), got here. Space ship? Time travel teeth...
Fossil teeth place humans in Asia '20,000 years early'
http://www.cnn.com/2015/10/15/china/china-teeth-cave-nature/
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